Gregory the Dialogist : We can also understand the two Testaments by the two angels. Hence also the two cherubim that cover the mercy seat look upon one another with their faces turned toward the mercy seat. For cherubim means fullness of knowledge. And what is signified by the two cherubim except both Testaments? And what is figured by the mercy seat except the incarnate Lord? Of whom John says: For he is the propitiation for our sins. And while the Old Testament proclaims that this was to be done which the New Testament declares was done concerning the Lord, it is as if both cherubim look upon one another, while they turn their faces toward the mercy seat, because while they see the incarnate Lord placed between them, they do not disagree in their view, for they narrate the mystery of his dispensation in harmony. — 40 Homilies on the Gospels, Homily 25 Origen of Alexandria : But also the oracles of the Lord, "the chaste oracles," are called "silver tried by fire." And likewise in another place the tongue of the just man is spoken of as "kindled silver." But the cherubim are called golden, since indeed they are interpreted as "the fullness of the knowledge of God." But also the candlestick in the tabernacle of the testimony was commanded to be set up golden and solid; which seems to me to hold the form of the natural law, in which the law of knowledge is held. … that gold is to be referred to the sense and the mind, but silver is to be referred to the word and to oracles? — COMMENTARY ON THE SONG OF SONGS, BOOK 2